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Speed Mathematics – Secret Skills for Quick Calculations E-Book by Bill Handley Free E-Book Download. This book is amust essential for all candidates who take up competitive exams, Time Exams like MAT, CAT, CET, GMAT, SAT, STEP etc. It also very useful to practice these steps to quickly solve mathematical problems, Calculations etc. YOu can multiply, divide any big numbers within seconds without using any calculators. Download Spped Mathematics e-book.